Nventor



(No Model.)-

O. H. TRASK.

GEAR.

No. 486,324. Patented Sept. 9, 1890.

WI 1 NESEEE- '5 INVENTU $75M ciulii fiwll UNITED STATES PATENT .OFFIcE;

CHARLES H. TRASK, OF LYNN, MASSACHUSETTS.

.G EAR.

SPECIFICATION forming part of Letters Patent No. 436,324, datedSeptember 9, 1890.

Original application filed December 9, 1889, Serial No. 333,164. Dividedand this application filed February 24, 1890. Serial No. SAL 16. (Nomodel.)

To all whom it may concern:

Be it known that 1, CHARLES H. TRAsK,of Lynn, in the county of Essex andState of Massachusetts, a citizen of the United States, have invented anew and useful Improvement in Gears, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, forming a part of this specification, in explaining itsnature.

The invention was originally described in my application for LettersPatent of the United States, filed December 9, 1889, Serial No. 333,164,and withdrawn therefrom b amendment.

It relates to a gear having at the inner end of each tooth-receivingrecess a slight projection or extension something in the form of a ribextending from side to side of the gear and forming a narrow seat,against which the ends of the teeth of the meshing gear or pinion comein contact, the advantage of the seat being that it is narrow andprevents the grinding of the end of the entering tooth upon a surface aslarge as the end of the tooth-receiving recess would present if thenarrow seat were not employed.

In making the seatI use a gear-cutter which is the subject-matter of theapplication above referred to.

In the drawings, Figure 1 is a view in plan of the gear-cutter forforming the seat. Fig. 2 is a view in vertical section thereof. Fig. 3is a detail view representing parts of two intermeshing gears toillustrate the application of the invention.

A represents two meshing gear-wheels; at, their teeth; a, theteeth-receiving recesses, and (1 a narrow seat at the inner end of eachrecess. These seats are formed integral with the metal of the gear bymeans of the millin g-tool B,havin g working-teeth b, of any suitableform, and also having in the'face of each tooth the rounded or V-shapedrecess 12. (See Fig. 2.) A tool having this recess will form as theteeth of the gear are being milled a seating-rib at the base of eachpocket or tooth-receiving recess.

Having thus fully described my invention, I claim and desire to secureby Letters Patent of the United States- As an improved article ofmanufacture, a gear having in each tooth pocket or recess a seating ribor bead 00*, as and for the purposes described.

CHARLES H. TRASK.

Witnesses:

F. F. RAYMOND, 2d, J M. DOLAN.

